1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75a45e789e9effdab0a8e66a6f3e4705318c167b52b153be2e1a5f22a8b2ff4. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/922fda2d-bc96-4380-ad85-4f69b3f500d4.json and https://artists.proofprofile.net/proofs/artist/922fda2d-bc96-4380-ad85-4f69b3f500d4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca7842e06865af351415e26057bc64a541a9ce4e58dba39cbf7989c2327b08d. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62428771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04c4bd015ac4caff8de0db33e46ffab4366441e8e5aea2f4138d07e72ba22a5. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62428774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f28c39ff660a4e0286ab6c0fc2d4e4909f9e1a22ac11ef9f8c8b22346c321e3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62428779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x381e22e3cff45cfa806bdaf6a8d83388ed1cb72dba273ae0e8ea071636e375f6. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62428784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0883f62ac28209e50ee52436f31a4cf04d6d76e2250670061619d9335cf5229. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62428787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc8a5e326b0f7c222df89e1ab08ac0621770245849b731c323bda3f7629613a8. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62428791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866bf946a0689f8d2622fbe4123a494d35d33fb377c968f187e701a7e7c3d568. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62428792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e227959d483161db6db4883cf6123ce563999b716c4e0245a909e53db4c96b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62428795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x204fa4b51017d79720cf7a1d69f252b36fbcfd702d6c2fe579441fb84ed3f5d3. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62428797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0d0396906419330a0ac9ddd801dd867dbde4767fce5511ad4af8016003f6c2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA62428799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b17ec1de980609b3d7b0e16d08a275dac55a9085896ee5fcaa1f8f1bcd9860. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA0P2361040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8123e6e92924de2a742c0b8b24db2f887aacbaec61eb43b0cbf047f505173632. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPU901803446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c62aba4356b8a8e3f43e609d804311c82eed16bf196d09372d771bb62266129. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6MZ2443625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe6953d8899598b3a11bf01db5bcffd6717aaeca3c95e44a13201a821362600. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6MZ2443626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4e13206d9ecede2edea7ee42281ff4e9c4328fda678b5746469bbe7473c99b3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6MZ2443627.